if we get the opportunity fortunate enough, then naturally we shall aspire to enter into the spiritual world. Bhaktivinoda Thakura said, krsnera samsara kara chadi' anacara: "If you want to enter into this association of spiritual kingdom, then practice here the family of Krsna." Just like here we are trying to be family members of Krsna. Here Krsna is sitting, Radha-Madhava is sitting on the throne. He is the enjoyer, and we are trying to serve Him so that He may very nicely enjoy. This is called Krsna family — center, Krsna. Just like in ordinary family the head man is there, and he is the chief man, and all other — his wife, children, servants, and other friends, associates, even animals, cats, dogs, cows — everyone is serving the center point, master. Similarly, our Krsna family means Krsna is the master, and He is the supreme enjoyer. Bhoktaram yajna tapasam sarva-loka-mahesvaram [Bg. 5.29]. And if we understand this point, that Krsna is the center, He is the enjoyer, and we are meant for serving Him for His enjoyment, that is Krsna family.
So in this way, in one life we may practice how to become free from this material contamination and execute devotional service as it is prescribed in the sastra and by the instruction of spiritual master. If we keep ourself pure without material contamination, then we become fit to enter into the family of Krsna. This is the process.
(Srila Prabhupada, speaking on Sri Caitanya-caritamrta, Adi-lila 1.16 — April 9, 1975, Mayapur)